contract pre cancellation letter/quotation

I have been contacting mtn regarding my pre cancellation quotation or letter but there's no response and its been months now. I went to the store they kept referring me to the call center which is not answering their phone(808) . I have been calling this number for weeks now, I even emailed the credit department and they only assisted with reactivating my services but have not escalated my query to the cancellations/ retention department. I want to know if i want to cancel my contract now how much termination fee IL be required to pay. I want the invoice emailed to me urgently today.